A high-intensity hockey game between the Dallas Stars and Montreal Canadiens took a turn for the worse in the third period when Andrew Shaw left the game with an injury.

Montreal defeated Dallas 4-2 on Tuesday but the game went sour when Shaw hobbled off the ice after a helmet-to-helmet collision with former teammate Greg Pateryn.

Goals from Brendan Gallagher and Artturi Lehkonen helped Montreal end a 5-game losing streak with a 4-2 win over Dallas. 0:30

Shaw knocked Pateryn down with a big hit along the boards with 11 minutes left to play but the Canadiens winger got the worst of it when their heads collided. With Shaw lying on the ice, Pateryn punched him twice in the head.

"Kind of makes you feel sick when you see that," said Montreal defenceman Karl Alzner. "It's like in UFC when the guy keeps going after a knockout. It's unacceptable. You get fired up in the moment and you do things you don't necessarily think through. It's not something you ever want to see."

Added Jonathan Drouin: "I thought Andrew's hit was clean. I didn't like the two punches at the end when his head was down on the ice. I think the league might take a look at that one."

After the hit, Shaw lay motionless for several minutes before getting to his feet. He had to be helped off the ice.

Claude Julien said the team's doctors were monitoring him but that he was not taken to hospital. He said Shaw was "shaken up" but did not call it a concussion. Shaw suffered two concussions last season.

Oh man that's not good. <br><br>Andrew Shaw throws a major hit on Greg Pateryn, but collides head on head too. <a href="https://t.co/nFD1lYZsyD">pic.twitter.com/nFD1lYZsyD</a>

"He took a run at me and his head hit mine," said Pateryn, who had an assist on Dallas' first goal of the game. "There's a reason why a guy like that gets four or five concussions a year. His play speaks for itself."

The Canadiens (26-32-12) scored three power-play goals as they snapped their five-game losing skid. Montreal had not won since Mar. 2.

Artturi Lehkonen scored twice and Brendan Gallagher and Nikita Scherbak had a goal apiece. Alex Galcheynuk had two assists.

Antti Niemi made 36 saves for his fifth victory of the season. Niemi has not lost in regulation time since Feb. 14. He's 3-0-3 since then. The Canadiens were at home for the first time following a six-game road trip (1-3-2).

Down 1-0, Lehkonen tied things up with a wrist shot, blocker side, on a fast break at 16:31 of the first period for his first of the game.

This is <a href="https://twitter.com/nikscherbak?ref_src=twsrc%5Etfw">@nikscherbak</a>. He makes power moves. <a href="https://t.co/XY5NkNuONv">pic.twitter.com/XY5NkNuONv</a>

A four-minute high-sticking penalty to Dan Hamhuis in the second changed the outcome of the game, with Montreal scoring twice in 35 seconds.

First, Lehkonen beat Kari Lehtonen five-hole from the slot at 8:41. And after Radek Faksa took a tripping penalty to give the Canadiens a two-man advantage, Gallagher scored his team-leading 26th of the season at 9:16.

Scherbak made it 4-2, again on the power play, at 9:26 of the third period.

"Especially at this time of the year, with teams pushing for the playoffs, every game is so tight," said Galchenyuk, who has eight points in his last eight games. "One or two power plays can make a big difference. It definitely gave us momentum today."

Radulov returns

The game marked Alexander Radulov's return to the Bell Centre. Radulov had not faced his former club in Montreal since signing with Dallas as a free agent in the off-season.

Faksa got Dallas (38-26-6) on the board at 11:48 of the first period as he deflected Pateryn's shot past Niemi. Jamie Benn made it 3-2 with 1:40 remaining in the second. Radulov got an assist on the goal.

The Stars have lost four of their past five games.

"It's bad," said Radulov. "We need points. We're in the playoff race and we didn't get it done. We put ourselves in that position. It's out fault."

Weber out 6 months

The Canadiens announced during the game that defenceman Shea Weber underwent surgery earlier on Tuesday to repair a torn tendon in his left foot. The team expects his recovery to last six months.

Weber is thought to have been injured when he was hit by a shot in the first game of this season. The 32-year-old has not played since Dec. 16.

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